GREENSTONE USA  is the leader in the manufacturing of vacuum tubes, vacuum capacitors, vacuum relays, vacuum interrupters and vacuum contactors.

GREENSTONE USA's extensive inventory assures you that we will have the part you are looking for when you need them. This allows us to guarantee same day shipping on all orders placed by 5:00 p.m. Eastern time, which in turn guarantees next day delivery of your order & we also guarantee the lowest prices on all our vacuum tubes, vacuum capacitors, vacuum interrupters, vacuum relays and medium voltage vacuum contactors.

GREENSTONE USA will custom manufacture vacuum tubes, vacuum capacitors, vacuum interrupters, vacuum relays and medium voltage vacuum contactors that will fit your own application and specifications.

• Industrial vacuum tubes
• Broadcasting vacuum tubes
• Ham Radio vacuum tubes
• Audio vacuum tubes
• CW magnetrons
• Vacuum capacitors
• Vacuum interrupters
• Vacuum relays
• Aluminum extruded heatsinks
• Vacuum contactors & starters